Meaning Heavenly Lake in Tibetan, Namtso is respected as one of the four holiest lakes in Tibet, it is also both the highest and biggest salt water lake in the world, 4718 meters above the sea level, 70 kilometers in length, 30 kilometers in width and 1940 square kilometers in size. It is a tidal lake and in clear weather, the magnificent views of the surrounding mountains dotted with tents of local nomads are splendid.